"SHORT THE SHORT!"
Both FAZ and SKF were at one point great shorts. SKF was the double-inverse of the financials long, and FAZ was the triple-inverse. Both these ETF's have a volatility premium, which means they will erode in value due to time decay, similar to an option.
In fact, the big brokers such as Fidelity and Schwab sent out warning letters recently to advise their clients that these were very aggressive ETF's and only suited for daytrading, not holding overnight. Fidelity now won't even let you buy these if you don't have at least an "aggressive" profile when you set up your account, and you must sign additional risk disclosures.
Jin Cramer at one point on his show about a year back said the SEC shouldn't even allow these ETF's to exist. Pete Najarian on Fast Money last March said to "short the short" by shorting the SKF. That would have been nice, as the SKF was over $200, and has lost almost 90% of its value. Another guest also said "get long" FAS around the same time, and that went from $3 up to about $14 before doing a 5 for 1 reverse split.
I agree with the post that "FAZ will not go to zero". They will do another reverse split, and get people to trade it because it does huge volume and makes millions of dollars in commissions for the brokers. So it's "buyer beware" and don't get suckered by these types of ETF's.
However, one point is certain, when the market DOES reverse, which at some point it will, the inverse ETF's will once again rally, where the volatility premium will work in the trader's favor. That's the ONLY time to buy them long to hold overnight. So keep watching FAZ, SKF, SDS and QID. Every dog has its day, and even these "dogs" will run up when the market tanks...